It depends on your personal situation and how much you see yourself flying afterwards but - just to give you another viewpoint:
I bought an aeroplane before I could fly and learned to fly on it. It was quite expensive to own it my self (the bearings in the engine collapsed after a year
)but I loved the availability - I ended up using it like a car. I loved it!
So, even a share I guess would be expensive if you're not going to fly much but if you see yourself doing a fair number of hours, there's nothing to compare! All IMHO, of course!